linux-kernel - [RFC v2 1/4] iommu/io-pgtable-arm: flush TLBs when IO_PGTABLE_QUIRK_TLBI_ON

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Message-Id: <1502459130-6234-2-git-send-email-eric.auger@redhat.com>
Date:   Fri, 11 Aug 2017 15:45:27 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Will.Deacon@....com, robin.murphy@....com,
        Jean-Philippe.Brucker@....com
Cc:     christoffer.dall@...aro.org, Marc.Zyngier@....com,
        alex.williamson@...hat.com, peterx@...hat.com, mst@...hat.com,
        tn@...ihalf.com, bharat.bhushan@....com
Subject: [RFC v2 1/4] iommu/io-pgtable-arm: flush TLBs when IO_PGTABLE_QUIRK_TLBI_ON_MAP

This patch implements the IO_PGTABLE_QUIRK_TLBI_ON_MAP quirk for
LPAE page tables. It forces TLB invalidations on map.

Signed-off-by: Eric Auger <eric.auger@...hat.com>

---
v1 -> v2:
- rebase on v4.13-rc2
---
 drivers/iommu/io-pgtable-arm.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index b182039..198a042 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -447,6 +447,8 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
 	arm_lpae_iopte *ptep = data->pgd;
 	int ret, lvl = ARM_LPAE_START_LVL(data);
 	arm_lpae_iopte prot;
+	struct io_pgtable *iop = &data->iop;
+	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 
 	/* If no access, then nothing to do */
 	if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
@@ -454,6 +456,12 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
 
 	prot = arm_lpae_prot_to_pte(data, iommu_prot);
 	ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep);
+
+	if (cfg->quirks & IO_PGTABLE_QUIRK_TLBI_ON_MAP) {
+		io_pgtable_tlb_add_flush(iop, iova, size,
+					 ARM_LPAE_GRANULE(data), false);
+		io_pgtable_tlb_sync(iop);
+	}
 	/*
 	 * Synchronise all PTE updates for the new mapping before there's
 	 * a chance for anything to kick off a table walk for the new iova.
@@ -739,7 +747,8 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
 	u64 reg;
 	struct arm_lpae_io_pgtable *data;
 
-	if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | IO_PGTABLE_QUIRK_NO_DMA))
+	if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | IO_PGTABLE_QUIRK_NO_DMA |
+			    IO_PGTABLE_QUIRK_TLBI_ON_MAP))
 		return NULL;
 
 	data = arm_lpae_alloc_pgtable(cfg);
@@ -828,7 +837,8 @@ arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
 	struct arm_lpae_io_pgtable *data;
 
 	/* The NS quirk doesn't apply at stage 2 */
-	if (cfg->quirks & ~IO_PGTABLE_QUIRK_NO_DMA)
+	if (cfg->quirks &
+		~(IO_PGTABLE_QUIRK_NO_DMA | IO_PGTABLE_QUIRK_TLBI_ON_MAP))
 		return NULL;
 
 	data = arm_lpae_alloc_pgtable(cfg);
-- 
2.5.5